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Emission and Air Quality Trends Review 1999-2011
Virginia July 2013
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Project Objective To develop and present publicly available information on trends in emissions and ambient air quality in the U.S. since 1999 in easy to understand visual and tabular formats
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Emission Trends Study Team collected and processed U.S. EPA emission inventories for years within the study period of interest ( ) By pollutant and source category electric utility coal fuel combustion mobile sources industrial fuel combustion & industrial processes all other
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Emissions Data Summary
Data Obtained from EPA National Emission Inventory (NEI) and Trends Websites EPA’s Trends reports and emission comparisons include interpolations of all categories between key years (1999, 2002, 2005, 2008, 2011) at county-pollutant level Represented Pollutants: VOC, NOx, SO2, and PM2.5 Project Improvement The Study Team augmented above data with year specific CEM emissions (2002 through 2011)
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Emission Changes The following slides also include the tonnage-based emissions change from 1999 to 2011 for each pollutant Negative values indicate decrease in emissions, positive values indicate an increase
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Virginia Emission Trends (VOC)
Annual Emissions (Tons) Source Category 1999 2001 2003 2005 2006 2007 2008 2009 2010 2011 Electric Utility Coal Fuel Combustion 458 447 423 290 267 285 277 219 205 529 Mobile Sources 206,798 185,336 186,732 173,008 164,785 156,561 136,782 123,807 110,832 122,499 Industrial Fuel Combustion & Processes 206,441 216,672 231,628 205,386 202,851 200,318 197,783 195,248 192,714 145,460 All Others 280 422 687 592 506 513 475 449 472 212 Total 413,978 402,877 419,470 379,276 368,409 357,678 335,317 319,723 304,224 268,701 Annual Emissions Change (Percent since 1999) 0% -2% -8% -37% -42% -38% -39% -52% -55% 16% -10% -16% -20% -24% -34% -40% -46% -41% 5% 12% -1% -3% -4% -5% -7% -30% 51% 145% 112% 81% 83% 70% 60% 68% 1% -11% -14% -19% -23% -27% -35%
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Virginia Emission Trends (VOC)
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Virginia Emission Trends (NOx)
Annual Emissions (Tons) Source Category 1999 2001 2003 2005 2006 2007 2008 2009 2010 2011 Electric Utility Coal Fuel Combustion 92,533 76,448 58,429 45,211 40,745 41,834 33,364 16,510 20,613 23,106 Mobile Sources 253,149 307,201 286,698 312,258 298,458 284,657 252,550 231,063 209,576 217,213 Industrial Fuel Combustion & Processes 115,567 118,199 112,500 109,837 108,488 107,431 105,830 104,364 103,402 54,832 All Others 11,251 11,799 22,871 20,385 16,215 17,908 20,090 18,664 20,761 11,350 Total 472,500 513,646 480,498 487,692 463,906 451,831 411,834 370,601 354,352 306,502 Annual Emissions Change (Percent since 1999) 0% -17% -37% -51% -56% -55% -64% -82% -78% -75% 21% 13% 23% 18% 12% -9% -14% 2% -3% -5% -6% -7% -8% -10% -11% -53% 5% 103% 81% 44% 59% 79% 66% 85% 1% 9% 3% -2% -4% -13% -22% -25% -35%
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Virginia Emission Trends (NOx)
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Virginia Emission Trends (SO2)
Annual Emissions (Tons) Source Category 1999 2001 2003 2005 2006 2007 2008 2009 2010 2011 Electric Utility Coal Fuel Combustion 217,746 203,299 210,895 205,157 181,021 175,764 130,556 98,703 91,730 69,535 Mobile Sources 17,150 15,689 18,502 14,907 13,183 11,460 7,708 6,479 5,251 4,544 Industrial Fuel Combustion & Processes 84,065 88,219 97,681 99,206 96,760 94,366 91,814 89,410 87,158 38,480 All Others 16,822 22,492 19,969 18,426 5,019 9,230 7,152 5,708 7,598 1,143 Total 335,783 329,699 347,047 337,695 295,984 290,820 237,230 200,300 191,737 113,702 Annual Emissions Change (Percent since 1999) 0% -7% -3% -6% -17% -19% -40% -55% -58% -68% -9% 8% -13% -23% -33% -62% -69% -74% 5% 16% 18% 15% 12% 9% 6% 4% -54% 34% 19% 10% -70% -45% -57% -66% -93% -2% 3% 1% -12% -29% -43%
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Virginia Emission Trends (SO2)
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Virginia Emission Trends (PM2.5)
Annual Emissions (Tons) Source Category 1999 2001 2003 2005 2006 2007 2008 2009 2010 2011 Electric Utility Coal Fuel Combustion 11,992 11,837 11,978 10,560 9,567 10,326 9,022 8,207 7,283 625 Mobile Sources 10,013 10,246 9,965 12,103 11,632 11,160 11,180 10,465 9,750 10,678 Industrial Fuel Combustion & Processes 43,201 46,278 45,196 45,998 45,606 45,235 44,837 44,439 44,068 28,554 All Others 43,017 30,154 19,478 16,597 15,879 16,133 15,858 15,736 15,918 18,997 Total 108,223 98,515 86,617 85,258 82,684 82,854 80,898 78,846 77,019 58,854 Annual Emissions Change (Percent since 1999) 0% -1% -12% -20% -14% -25% -32% -39% -95% 2% 21% 16% 11% 12% 5% -3% 7% 6% 4% 3% -34% -30% -55% -61% -63% -62% -56% -9% -21% -24% -23% -27% -29% -46%
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Virginia Emission Trends (PM2.5)
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Emission Trends Summary
All pollutants have decreased since 1999 in aggregate across Virginia NOx and SO2 from Electric Utility Fuel Combustion sources show significant decrease over time as a result of Acid Rain Program, NOx Budget Trading Program and CAIR control implementation Onroad emission step increase seen between 2004 and 2005 is the result of EPA’s method change and MOVES model integration for estimating onroad mobile source emissions
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Air Quality Design Values
Ozone Annual 4th highest daily maximum 8-hour average averaged over three consecutive years Current standard = ppm PM2.5 Annual Annual arithmetic mean of quarterly means averaged over three consecutive years Current standard = 12 ug/m3 PM Hour Annual 98th percentile of daily averages averaged over three consecutive years Current standard = 35 ug/m3
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State-Wide Design Value (DV) Trends
Trends in state-wide maximum DV and average DV Max DV: Maximum DVs over all valid trend monitoring sites in the state in each overlapping three year period Average DV: Average of DVs over all valid trend monitoring sites in the state in each overlapping three year period Compute linear trend via least-squares regression
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Data Handling Procedures
O3 design value (DV) for each overlapping three- year period starting with and ending with DV calculated using annual 4th highest daily max 8-hr averages and percent of valid observations, based on EPA data handling conventions Data associated with exceptional events that have received EPA concurrence are omitted Selection of trend sites require valid DV in 9 out of 11 three-year periods between 1999 and 2011 Identification of nonattainment areas is with respect to the hour standard only
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Data Handling Procedures
Annual PM2.5 DV and 24-hr PM2.5 DV for each overlapping three-year period starting with and ending with DV calculations based on EPA data handling conventions Data extracted from monitors that have a non- regulatory monitoring type are omitted Selection of trend sites require valid DV in 9 out of 11 three-year periods between 1999 and 2011
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Trend in units of ppb/year
Trend Calculation Trend in units of ppb/year Trends based on linear least squares fit to rolling three year design values (DVs) Negative trend indicates improving air quality DVs based on each 3-year period: , , … Notes On plots, DVs are for three year period ending in year shown (i.e., DV plotted as 2011 value) Ozone trend values expressed as ppb/year (1,000 ppb = 1 ppm); DVs are plotted as ppm Scale in units of ppm
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Max/Ave O3 DVs and Trend
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Ozone Trends by Site in Virginia
Monitoring Sites County DV [ppm] Trend [ppm/yr] Arlington, VA 0.08 -1.89 Caroline, VA 0.07 -1.28 Charles City, VA 0.075 -1.52 Chesterfield, VA 0.072 -1.44 Fairfax, VA N/A -1.92 -1.87 0.082 -1.41 -1.15 Fauquier, VA 0.064 -1.90 Frederick, VA 0.066 Hanover, VA 0.073 -2.40 Henrico, VA 0.074 Note: Only monitoring sites meeting data completeness criteria listed
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Ozone Trends by Site in Virginia
Monitoring Sites County DV [ppm] Trend [ppm/yr] Loudoun, VA 0.073 -1.62 Madison, VA 0.071 -1.71 Page, VA 0.066 -1.83 Prince William, VA 0.069 -1.81 Roanoke, VA 0.068 -1.95 Rockbridge, VA 0.063 Stafford, VA 0.072 -1.61 Wythe, VA 0.064 -1.85 Alexandria, VA 0.077 -1.65 Suffolk, VA -1.92 0.07 -1.38 Note: Only monitoring sites meeting data completeness criteria listed
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Max/Ave PM2.5 Annual DVs and Trend
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Max/Ave PM2.5 24-Hour DVs and Trend
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PM2.5 Trends by Site in Virginia
DV [ug/m3] Trend [ug/m3 per year] Monitoring Site County Annual 24-Hr Annual DV 24-Hr DV Arlington N/A -0.47 -1.42 Charles City 8.9 20 -0.46 -1.35 Chesterfield 9.6 21 -0.48 -1.56 Fairfax 24 -1.46 -1.22 Henrico 22 -0.51 9.0 -1.26 Loudoun 9.5 -1.65 Page 9.3 -0.43 -1.23 Bristol city 9.9 -0.57 -1.60 Norfolk city 10.0 26 -0.31 -0.82 Virginia Beach city 23 -0.32 -0.93 Note: Only monitoring sites meeting data completeness criteria listed
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Air Quality Trends Summary
Average O3 and PM2.5 design values have decreased since 1999 in Virginia O3 and annual PM2.5 design values have decreased since 1999 in Washington, DC-MD-VA, the only currently designated O3 and PM2.5 non-attainment area in Virginia
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